SOLUTION: Hi..I was able to get part of the question, just not sure how to get the other part. The earth as a radius of 6380 km. The formula for the volume of a sphere is V=4/3 pie r s

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Hi..I was able to get part of the question, just not sure how to get the other part. The earth as a radius of 6380 km. The formula for the volume of a sphere is V=4/3 pie r s      Log On


   

Question 470199: Hi..I was able to get part of the question, just not sure how to get the other part.
The earth as a radius of 6380 km. The formula for the volume of a sphere is V=4/3 pie r sq. The forula for surface area of a sphere is A= 4 pie r sq. Find the voume and surface area of the earth and write the answer in scientific notation with tw numbers after the decimal. The answer I got was 5.12 * 10 to the 8th power. Not sure how to get the second answer... thank you.
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Hi..I was able to get part of the question, just not sure how to get the other part.
The earth as a radius of 6380 km. The formula for the volume of a sphere is V=4/3 pie r sq. The forula for surface area of a sphere is A= 4 pie r sq. Find the voume and surface area of the earth and write the answer in scientific notation with tw numbers after the decimal. The answer I got was 5.12 * 10 to the 8th power. Not sure how to get the second answer... thank you.
...
Area of sphere:4πr^2
=4π(6380^2)
=4π*(6.38*10^3)^2
=4π*6.38^2*10^6
=511.5*10^6
=5.12*10^8 km^2
***
volume of a sphere is V=(4/3)πr^3
=(4/3)π(6380)^3
=(4/3)π*(6.38*10^3)^3
=(4/3)π*6.38^3*10^9
=1087.8*10^9
=10.88*10^11 km^3
**
ans:
Surface area of Earth=5.12 *10^8 km^2
Volume of Earth = 10.88*10^11 km^3